Abstract: In order to determine the influence level of roof fracture position at the ending stage of fully-mechanized face on retracement channel, based on the different fracture forms of roof after the cut-through of woking face, we established the roof structure mechanical model of retracement channel by theory of elastic mechanics. We analyzed the stress relationship of roof fracture position and pillar side of protective pillar in retracement channel after the cut-through of working face, obtained the vertical stress calculation formula of pillar side under different roof fracture positions. According to the protective coal pillar stress test results in 15205 and 15206 fully-mechanized faces retracement channel of Hongliulin Coal Mine, combined with the stress calculation formula, we determined the roof fracture position of retracement channel.